What's the approximate minimum thickness of the mortar used in the soldier course? I tapered my soldiers (full bricks, standing on end), but I'm not sure how much space to allow for mortar. Zero at the inside edge and ... maybe 1/8" at the outside? Is 1/16th better? Or 1/4"? I assume there will be some outward force from the dome and that some amount of mortar is necessary, but I have no idea how much to plan for.
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